Kate Middleton's vacation puts island on lockdown

It has long been an idyllic retreat for the rich and famous -- so you wouldn't think the presence of Royalty would cause a stir.

Family fun: Other than Pippa, Kate is joined by her mother Carole, father Michael and brother James. File pic

But the arrival of Kate and her family on the privately owned island of Mustique has upset fellow holidaymakers.Heightened security measures to ensure Kate's privacy mean the Mustique Company, which owns the Caribbean island, is restricting the movements of other guests. Tourists have been told that if they wish to dine at one of the island's two hotels they must travel in a vehicle provided by the venue.

They are banned from using the rented mules -- the island's fleet of souped-up golf carts -- in case they try to take pictures at the Middleton family's Aurora villa, featuring its own plunge pool and a stunning ocean view.

There have also been reports of guests being quizzed by security men while walking on the beach.

One local millionaire said: "This isn't exactly the way one expects to be treated when you pay very good money to visit the most exclusive island in the Caribbean."

Kate's party includes her parents Michael and Carole, sister Pippa and younger brother James. Prince William is expected to join them shortly.